Means for transmitting varying rotary motion



F. WRITE MEANS FOR TRANSMITTING VARYING ROTARY MOTION i5 heet 1 Inn", y

Fileql April 6, 1921 4 Wad/T,

March 24, 1925. 1,530,920

F. WAITE MEANS FOR TRKNSMITTIflG VARYING ROTARY MOTION Filed April 6, 1921 3 Sheets-91188! 2 March 24, 1925. 1,530,920

F. WAlTE IIEANS FOR TRANSMITTING VQRYING ROTARY MOTION 3 Sheets-Sheet 5 will]!!! v Filed April a, 192i r llllll Patented Mar. 24, I925.

STAT

FRED WAIIE, O'F OTLEY, ENGLAND.

MEANS FOR TRANSMITTING VABYING ROTARY MOTION.

Application filed April 6, 1921.

To all whom it may concern:

Be it known that I, Fnnn Wnrrn, a subject of the King of Great Britain, and resident of Otley, in the county of York, England, have invented a certain new and useful Improvement in Means for Transmitting Varying Rotary Motion, of which the following is a specification.

In connection with machinery and apparatus for many and varied purposes, it is often necessary, in order to keep up the speed or output of the machine, that certain parts of said machinery or apparatus (which are prevented from performing their functions efficiently on account of such excessive speed) should be so constructed and arranged that during the period where the speed docs not interfere with efiiciency, such speed should be kept at a maximum, while when approaching the part where the speed has to be reduced that such speed should be made commensurate with efficiency by being reduced to enable the effective performance of the functions required. Particularly is this the case in printing machines wherein single sheets of paper or the like have to be fed so that each one may be arrested in position where it is accurately held as it is registered for the subsequent printing operations to be carried out. And it is to this type of machine that my invention more particularly relates, although it is obvious that the functions performed in accordance with my said invention may be advantageously made use of in connection with other types of machines. lrly said invention consists in so constructing the driving or driven parts of the apparatus that I may use a cam wheel of special construction, the cam surface of which is of such contour as to meet the requirements or to carry out the functions desired, and I form this cam wheel to carry out said functions positively by following the novel method of construction hereinafter described.

In the accompanying sheets or drawings which are illustrative of my invention,

Fig. 1 is a sectional side elevation showing the construction and arrangement of the essential elements forming my improved apparatus.

Fig. 2 is a plan. of the parts shown by Fig. 1.

Serial No. 458,920.

Fig. 3 is a similar view to Fig. l, but shows a variation in the arrangement of certain devices used in connection with my essential elements as hereinafter explained.

Fig. 4: is a plan of the parts shown by Fig. 3.

Fig. 5 is also similar to Figs. 1 and 3 but illustrates a further variation in the arran gement of parts used in connection with my essential elements.

Fig. 6 is aplan of Fig. 5.

Figs. 7 and 8 are crawings in detail of parts hereinafter explained.

The said several figures illustrate the application of my improved mechanism to the feed mechanism of a printing or like machine from which it will readily be understood how the same mechanism may be used in conjunction with other devices requiring the apparatus for performing similar functions.

In carrying my invention into effect I make use of a cam wheel 2, which may be either the driver or the driven wheel as is obvious, although in all the drawings I have shown said cam wheel to be the driver.

In the arrangement shown by Figs. 1 and 2 the cam wheel 2 has a chain 3, which is of any well known construction that makes it suitable for engagement with the teeth of a sprocket wheel thus by placing said chain 3 around the periphery of the cam wheel 2 and by arranging a portion 2* of said cam wheel 2 to be adjusted to take up the slack of said chain by means of the adjusting screws 4 we are enabled to make said chain adhere firmly to the periphery of said cam wheel 2. By thus mounting the chain 3 upon the cam wheel 2 we form a toothed Wheel which will engage with the teeth of a driven wheel 5.

Where the chain 3 requires to be more firmly secured upon the periphery of the wheel 2 than can be effected by the mere force of the expanding part 2 we then have extensions 3 from the chain 3 to be secured by screws 6 as illustrated by Fig. 7

The wheel 5 which meshes with the pins or cross bars of the chain 3 forming the cam wheel 2 has teeth of an appropriate formation to engage with said chain 3,

said teeth being therefore of the character of those of a sprocket wheel. This wheel 5 is mounted upon a lever or arm 7 which is free to oscillate with the shaft 8 upon which it is fixed as shown by Figs. 1 and 2, although as shown by Figs. 3, 4t and 5 said lever 7 may not be fixed upon the shaft 8, but may loosely take over same. The wheel 5 has mounted upon its hub or extended sleeve 5 (see Fig. 2) another sprocket wheel 9 so that both of them may take over one and the same pivotal supporting stud 10 upon which they revolve freely.

Taking over the sprocket wheel 9 is a chain 11 which is arranged to take over another sprocket wheel 12 mounted to revolve upon the shaft 8, thus the centre of rotation of the wheel 12 is coincident with the axial centre of said shaft 8, consequently any movement transmitted to the arm 7 (as hereinafter described) does not interfere with the ellicient rotating of the wheel 12 as same is being operated by its chain 11. Mounted upon the sleeve or hub of the wheel 12 is a pinion 13 which is thus mounted in order that it may have motion transmitted to it by said wheel 12 and this pinion 13 gears with another pinion 1% fixed upon the shaft 15 upon which shaft 15 the series of tape rollers 16 are mounted, thus said rollers 16 are caused to revolve in accordance with the movements or actions of the wheel 5 through the gearing described. The tapes 17 which are to feed the sheets of paper to the printing and like machine are arranged to take over the carrying rollers 18 in the usual and well known manner.

In accordance with the arrangement shown by Figs. 1 and 2, the lever 7 is made to force the wheel 5 into engagement with the chain 3 by the recoil of a spring 19 which is fixed to the framework A at one end and to a lever 20 at the other end. The lever 20 is fixed upon the shaft 8 so that the recoil of the spring 19 has the effect of causing the wheel 5 through the medium of the levers 20 and 7 to keep in engagement with the chain 3.

To prevent the spring 19 from forcing the wheel 5 too deeply into gear with the chain 3 I have mounted upon the driving shaft a a cam 21 the peripheral contour of which corresponds with the contour of the pitch line of the cam wheel 2 in order that a bowl or runner 22 (see Fig. 2) mounted upon the stud 10 carrying the wheel 5, may revolve upon the peripheral surface of said cam 21 thus at all times the proper and desired engagement of the wheel 5 with the chain 3 is secured.

Instead of having the lever 7 forced into engagement with the cam 2 as is illustrated by Figs. 1 and 2 we may have an additional arm 7 extending from the arm 7 and upon the outer end of this arm 7 we may mount a runner 22 which will engage with a cam 23 which is of a contour shown by Fig. 3

so that as the cam wheel 2 revolves said cam 23 will operate the lever arm 7 and therefore also the lever 7 in order to cause the wheel 5 to mesh or gear with the chain 3 in the desired manner.

Further than this, however, I may still make use of another arrangement for keeping the wheel 5 in engagement with the chain 3 by arranging the lever 7 to have an extension 24 upon which I mount a runner 25. This runner 25 rotates in the cam groove 26 which is formed in the lateral surface of the cam wheel 2 as shown by Fig. 5. From the foregoing description it will be observed that the regular rotations of the driving shaft a are caused (on account of the irregularity in the contour of the cam wheel 2) to give varying motion to the driven wheel 5 and that as said varying motion is thus transmitted to said wheel 5 it will also be transmitted through the intermediate driving gear connections to the rollers 16 hence the feeding taps 17 are made to travel during one portion of their motion at a comparatively quick speed and at another portion of their motion comparatively slowly by which means I attain the object desired.

I have shown according to Fig. 5 that instead of using a chain 3 to form the cam wheel 2 I have said cam wheel 2 of the shape desired and formed by pins 27 which extend laterally from the face of the wheel 2 and with these pins 27 the sprocket wheel 5 engages in like manner to its engagement with the chain 3 shown by the other drawings. In this arrangement I am enabled to modify the contour of the cam wheel so that a part at 2 is made to approach the center of said cam wheel.

On the other hand when it is desired to make the chain 3 enter such a hollow space as 2 shown by Fig. 5, I may make use of a connection 3 as shown bv Fig. 7 which will pull the chain down into the hollow part 2 The cam wheel 2 shown by Fig. 5 has the pins 27 shown cylindrical in order to gear with the sprocket wheel 5, but where it is desired to use a spur wheel then the projections 27 may be of the shape shown by Fig. 8, in which case they are made to project from the face of the wheel 7 so that an ordinary spur wheel 5 may mosh therewith as shown by said Fig. 8.

I am aware that instead of making use of the chain 11 for transmitting the rotary motions of the wheel 5 to the parts described, I may mount a series of pinions or intermediate gearing wheels between the wheel 9 and the wheel 12 and arrange said series of intermediate wheels to be carried by the lever 7 although for varied reasons I prefer making use of the devices hereinloefore described.

Such being the nature and object of my said invention, what I claim is 1. The combination of a shaft, a cam rotatably connected to the shaft, a circular, centrally mounted, sprocket, means for rotating said sprocket at a varying speed determined by the contour of the cam, a pinion, a second circular, centrally mounted, sprocket rotatably connected to the pinion, and a chain connecting the sprockets, for the purpose described.

2. The combination of a shaft, a cam rotatably connected to the shaft and provided about its periphery with sprocket engaging means, a sprocket engaging the cam, a circular, centrally mounted, gear rotatably connected to the sprocket, and means for maintaining the sprocket and cam in engagement, for the purpose described.

3. The combination of a shaft, a cam rotatably connected to the shaft, a sprocket chain secured about the periphery of the cam, a circular, centrally mounted, sprocket supported to move toward and from the axis of the cam and adapted to engage said chain, a gear connected to the sprocket to rotate therewith, and means for maintaining engagement between the sprocket and chain on the cam, for the purpose described.

4c. The combination of a shaft, a cam rotatably connected to the shaft, a circular, centrally mounted, sprocket, means for rotating said sprocket at a varying speed determined by the contour of the cam, a circular, centrally mounted, pinion, a circular sprocket mounted coaxial with and connected to the pinion, and a chain connecting the sprockets.

5. The combination of a driving shaft, a driven shaft, a cam mounted coaxial with one of said shafts, a circular gear mounted centrally on the other shaft, a sprocket mounted to turn with the gear, a second circular, centrally mounted, sprocket, means for rotating said second sprocket at a varying speed determined by the contour of the cam, and a chain connecting the sprockets.

6. The combination of a driving shaft, a driven shaft, a cam secured on one of said shafts, a gear on the other shaft, a pinion engaging the gear, a sprocket mounted coaxial with the pinion, an arm supported to rock about the axis of said pinion and sprocket, a second sprocket mounted on said arm, means for rotating the last said sprocket at a varying speed determined by the contour of the cam, and a chain connecting the sprockets.

FRED VVAITE. 

